git log -S doesn't respect --no-textconv:

    $ echo '*.txt diff=wrong' > .gitattributes
    $ git -c diff.wrong.textconv='xxx' log --no-textconv -Sfoo
    error: cannot run xxx: No such file or directory
    fatal: unable to read files to diff

Reported-by: Matthieu Moy <matthieu....@grenoble-inp.fr>
Signed-off-by: Simon Ruderich <si...@ruderich.org>
---
 diffcore-pickaxe.c     | 12 ++++++++----
 t/t4209-log-pickaxe.sh | 14 ++++++++++++++
 2 files changed, 22 insertions(+), 4 deletions(-)

diff --git a/diffcore-pickaxe.c b/diffcore-pickaxe.c
index 3124f49..26ddf00 100644
--- a/diffcore-pickaxe.c
+++ b/diffcore-pickaxe.c
@@ -86,8 +86,10 @@ static int diff_grep(struct diff_filepair *p, struct 
diff_options *o,
        if (diff_unmodified_pair(p))
                return 0;
 
-       textconv_one = get_textconv(p->one);
-       textconv_two = get_textconv(p->two);
+       if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
+               textconv_one = get_textconv(p->one);
+               textconv_two = get_textconv(p->two);
+       }
 
        mf1.size = fill_textconv(textconv_one, p->one, &mf1.ptr);
        mf2.size = fill_textconv(textconv_two, p->two, &mf2.ptr);
@@ -201,8 +203,10 @@ static int has_changes(struct diff_filepair *p, struct 
diff_options *o,
        if (!o->pickaxe[0])
                return 0;
 
-       textconv_one = get_textconv(p->one);
-       textconv_two = get_textconv(p->two);
+       if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
+               textconv_one = get_textconv(p->one);
+               textconv_two = get_textconv(p->two);
+       }
 
        /*
         * If we have an unmodified pair, we know that the count will be the
diff --git a/t/t4209-log-pickaxe.sh b/t/t4209-log-pickaxe.sh
index eed7273..953cec8 100755
--- a/t/t4209-log-pickaxe.sh
+++ b/t/t4209-log-pickaxe.sh
@@ -116,4 +116,18 @@ test_expect_success 'log -S -i (nomatch)' '
        test_cmp expect actual
 '
 
+test_expect_success 'log -S --textconv (missing textconv tool)' '
+       echo "* diff=test" >.gitattributes &&
+       test_must_fail git -c diff.test.textconv=missing log -Sfoo &&
+       rm .gitattributes
+'
+
+test_expect_success 'log -S --no-textconv (missing textconv tool)' '
+       echo "* diff=test" >.gitattributes &&
+       git -c diff.test.textconv=missing log -Sfoo --no-textconv >actual &&
+       >expect &&
+       test_cmp expect actual &&
+       rm .gitattributes
+'
+
 test_done
-- 
1.8.2

-- 
+ privacy is necessary
+ using gnupg http://gnupg.org
+ public key id: 0x92FEFDB7E44C32F9
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